The latest version that I downloaded works fine.
To summarize , what I think is essential to your work .
1 / rugged coast - excellent , no need to change anything .
2 / marsh - great, maybe it would help generate more marsh around rivers and lakes.
3 / in the embedded file FracturedWorld_102_mst.py the choice of smaller and larger maps, but it is not good ... it is not your job . You've just customized to work with your script .
4 / The Power of the Planet Generator script is that people with weak computer can choose a small map of the continent and increase choice : max 30 % water . So get a big continent on a small map .
If you know of someone who can merge points 1 , 2 and 4 , making a simple and very useful script for normal game with bts 1,19
In any case, your work is good and I will use it sometimes , I enjoyed the marsh and rugged coast